A random sample of 114 lightning flashes in a certain region resulted In a sampl

Question

A random sample of 114 lightning flashes in a certain region resulted In a sample average radar echo duration of 0.78 sec and a sample standard deviation of 0.38 sec. Calculate a 99% (two-sided) confidence interval for the true average echo duration fi. (Round your answers to two decimal places.) Interpret the resulting interval. We arc 99% confident that the true population mean lies below this interval. We are 99% confident that this interval does not contain the true population mean. We are 99% confident that the true population mean lies above this Interval. We are 99% confident that this interval contains the true population mean. You may need to use the appropriate table in the Appendix of Tables to answer this question.

Explanation / Answer

4th option i.e.

we are 99% confident that this interval contains the true population mean.

n 114 x bar 0.78 s 0.38 sem 0.03559 99% z 2.58 Margin of error 0.091823 Confidence int LB 0.688177 Ub 0.81559

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